Process of welding chain-links.



B. RAPPOS.

PROCESS OF WELDING CHAIN LINKS.

APPLICATION FILED SEPT. 1, 1910.

Patented June 20, 1911.

2 SHEETS-SHEET 1.

B. RAPPOS. PROGESS OF WELDING GHAIN LINKS.

APPLIUATI-ON FILED SEPT. 1, 1910. I 995,565, 5 Patented June 20,1911.

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IIITE 1.:- FIG BELA RAPPOS, OF VIENNA, AUSTRIA-HUNGARY.

PROCESS OF WELDING- CHAIN-LINKS.

To all whom it may concern:

Be it known that I, BiiLA RAPPos, a subject of the Emperor ofAustria-Hungary, residing at 61 Schiittelstrasse, in the city of Vienna,in the Province of Lower Austria and Empire of Austria-Hungary, haveinvented new and useful Improvements in the Process of lVeldingChain-Links, of which the following is a specification.

This invention relates to the process of closing the gap in a chain linkthrough which the adjacent links are hung in.

According to the invention, the gap is first formed in the swaged linkby cutting out a portion somewhat broader than the thickness of thelinks, hereafter the two adjacent closed links are hung in, an exactlyfitting piece, made of the same material as the link and of somewhatlarger oval cross section is pressed into the gap, the said closingpiece and the neighboring portions of the chain link are heated towelding heat, and in this state the link is placed into a welding-die,whose grooves correspond in shape to the three chain links, and uponwhich a suitably shaped second die is applied under strong pressure. Thetwo dies being brought into mutual contact, the soft metal is, by theshape of the grooves in the dies, prevented from giving way along thesurface of the link and consequently the metal particles at either sideof the surfaces limiting the gap are compelled to interfuse the one withthe other.

In order to make the invention fully understood, the same is hereinafterdescribed with reference to the annexed two sheets of drawings, inwhich- Figures 1 and 2 are a side elevation and top view respectively ofan oval chain link provided with the said gap; Fig. 3 is a sideelevation of the chain link with the gap having hooked into one half aportion of finished chain and into the other half a closed link; Fig. 4shows a length of chain in top view; Fig. 5 is a sectional sideelevation of the two welding-dies and a link inserted into the lowerdie, the upper die being not yet lowered; Fig. 6 is a top view of thelower die; Fig. 7 is a sectional elevation, at right angles to Fig. 5,of the welding-dies and the inserted link, the upper die being lowered;Fig. 8 is a top view of the upper die; Fig. 9 is a cross-section, drawnto a larger scale, of the oval link having its Specification of LettersPatent.

Application filed September 1, 1910..

Patented June 20, 1911. Serial No. 580,008.

gap closed; Fig. 10 is a side elevation of the chain link shown in Fig.9; Fig. 11 shows a chain with 8-shaped links, made by welding the linksaccording tothe process referred to; Fig. 12 shows a chain, in whose8-shaped links the two eyes are distorted 90 against each other.

It will be seen from Fig. 1 that the oval chain link, preferably formedby the way of swaging, has a portion of its circumference cut out inorder to form the gap (4, the breadth of which somewhat exceeds thethickness of the links, in order to admit of a length of finished chainand a new link being hooked into the link to be welded as shown in Fig.3. The gap a is hereafter closed by the insertion of a piece Z) made ofthe same metal (iron or steel) as the chain link, exactly fitting thegap, but being of oval instead of circular cross section, as shown inFig. 9, and thus comprehending somewhat more material than wouldbe'required for filling up the gap. The filling piece Z) and theportions of the link'next the gap are now heated to welding heat and theheated parts are laid into the corresponding grooves of a welding die aresting on the table of a press, whereupon the upper die d is lowered bythe press. As the surplus material of the piece 6 is by the dies 0 and(Z prevented from giving way radially, the particles of the softmetalare compelled to interfuse the one with the other. In most cases, bothends of the filling piece 6 bulge out in the shape of calottes asindicated by the dotted lines in Fig. 10.

From Fig. 4 it may be inferred that in chains having their links weldedaccording to the described process, only each second link has a weld.

In the chains shown by Figs. 11. and 12 either of the two eyes of eachlink has a gap cut out for the insertion of a full eye of the next link.

As the surfaces of the gap and of the filling piece are in intimatecontact before these parts are heated, no scales can form on the saidsurfaces, which interfuse with each other and, under the action ofpressure, afford a weld of great strength.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

A process of welding chain links, which consists in forming a gap in achain link,

hookingi into the said link the tWo neigh- In Witness whereof I havesigned this boring inks, closing the gap by an exactly specification inpresence of tWo Witnesses. fitting piece of the same metal and of largerBELA RAPPOS cross-section than the link, heating the closing piece andthe portions of the link next WVitnesses:

the gap to Welding heat, and jumping the VICTOR KERPL, closing piece.AUGUST FUGGER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

